gray scale value?

[Sasmita Rath]

Hello Friends,
I'm writing a macro in which I want to read my program the pixel level gray scale values.I run the program to open the text file.But I can't figure out how to read each single pixel

value. Basically I'm asking if there is a command in ImageJ that reads those value automatically.

Could anyone please help?

Thanks,
Sasmita

[Joachim Wesner]

Hi Sasmita!

this is a bit confusing! Dou you want to read pixel values from a regular
binary image file (.TIF or whatever) or from a *TEXT* file that specifies
pixel by pixel?

In can of an image loaded into ImageJ, you can use

>getPixel(x, y)
>Returns the value of the pixel at (x,y). Note that pixels in RGB images
contain red, green and blue components that need to be
>extracted using shifting and masking. See the Color Picker Tool macro for
an example that shows how to do this.

in a loop inside a macro. Please lookup the documentation

http://rsb.info.nih.gov/ij/docs/ImageJMacroLanguage.pdf

Cheers

Joachim


Leica Microsystems CMS GmbH | GmbH mit Sitz in Wetzlar | Amtsgericht
Wetzlar  HRB 2432
Geschäftsführer:  Dr. Stefan Traeger | Dr. Wolf-Otto Reuter | Dr. David Roy
Martyr | Colin Davis

ImageJ Interest Group <[hidden email]> schrieb am 03.06.2008 23:07:55:

> Hello Friends,
> I'm writing a macro in which I want to read my program the pixel
> level gray scale values.I run the program to open the text file.But
> I can't figure out how to read each single pixel
>
> value. Basically I'm asking if there is a command in ImageJ that
> reads those value automatically.
>
> Could anyone please help?
>
> Thanks,
> Sasmita

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[Sasmita Rath]

Hi Joachim,
Yes I got it.Many thanks.

Sasmita
----- Original Message -----
From: "Joachim Wesner" <[hidden email]>
To: [hidden email]
Sent: Wednesday, June 4, 2008 1:47:20 AM GMT -06:00 US/Canada Central
Subject: Antwort: gray scale value?

Hi Sasmita!

this is a bit confusing! Dou you want to read pixel values from a regular
binary image file (.TIF or whatever) or from a *TEXT* file that specifies
pixel by pixel?

In can of an image loaded into ImageJ, you can use

>getPixel(x, y)
>Returns the value of the pixel at (x,y). Note that pixels in RGB images
contain red, green and blue components that need to be
>extracted using shifting and masking. See the Color Picker Tool macro for
an example that shows how to do this.

in a loop inside a macro. Please lookup the documentation

http://rsb.info.nih.gov/ij/docs/ImageJMacroLanguage.pdf

Cheers

Joachim


Leica Microsystems CMS GmbH | GmbH mit Sitz in Wetzlar | Amtsgericht
Wetzlar  HRB 2432
Geschäftsführer:  Dr. Stefan Traeger | Dr. Wolf-Otto Reuter | Dr. David Roy
Martyr | Colin Davis

ImageJ Interest Group <[hidden email]> schrieb am 03.06.2008 23:07:55:

> Hello Friends,
> I'm writing a macro in which I want to read my program the pixel
> level gray scale values.I run the program to open the text file.But
> I can't figure out how to read each single pixel
>
> value. Basically I'm asking if there is a command in ImageJ that
> reads those value automatically.
>
> Could anyone please help?
>
> Thanks,
> Sasmita

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email 
______________________________________________________________________

[Sasmita Rath]

Hi Joachim,
I am getting difficulty in finding the gray scale value of an image.
My problem is when I get the pixel value for (0,0) coordinate using macrofunction getPixel(0,0)from .tif file I get value1(say).
But when I open the .dat file for the same image with "TextFile..." command I get a different value for (0,0) coordinate value2(say). I believe both the values should return the same value because they both are the same pixel of the same image.

Please correct me if I'm doing something wrong.
waiting for your reply.
Thanks,
Sasmita







----- Original Message -----
From: "Joachim Wesner" <[hidden email]>
To: [hidden email]
Sent: Wednesday, June 4, 2008 1:47:20 AM GMT -06:00 US/Canada Central
Subject: Antwort: gray scale value?

Hi Sasmita!

this is a bit confusing! Dou you want to read pixel values from a regular
binary image file (.TIF or whatever) or from a *TEXT* file that specifies
pixel by pixel?

In can of an image loaded into ImageJ, you can use

>getPixel(x, y)
>Returns the value of the pixel at (x,y). Note that pixels in RGB images
contain red, green and blue components that need to be
>extracted using shifting and masking. See the Color Picker Tool macro for
an example that shows how to do this.

in a loop inside a macro. Please lookup the documentation

http://rsb.info.nih.gov/ij/docs/ImageJMacroLanguage.pdf

Cheers

Joachim


Leica Microsystems CMS GmbH | GmbH mit Sitz in Wetzlar | Amtsgericht
Wetzlar  HRB 2432
Geschäftsführer:  Dr. Stefan Traeger | Dr. Wolf-Otto Reuter | Dr. David Roy
Martyr | Colin Davis

ImageJ Interest Group <[hidden email]> schrieb am 03.06.2008 23:07:55:

> Hello Friends,
> I'm writing a macro in which I want to read my program the pixel
> level gray scale values.I run the program to open the text file.But
> I can't figure out how to read each single pixel
>
> value. Basically I'm asking if there is a command in ImageJ that
> reads those value automatically.
>
> Could anyone please help?
>
> Thanks,
> Sasmita

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email 
______________________________________________________________________